On the room to the right of T'Lon the Powermonger is the shard chest ( -96, 16, -365 ) /waypoint -96, 16, -365. The House item painting can also be picked up there from a chest at ( -90, 18, -394 ) /waypoint -90, 18, -394. When walking into that room you'll also get an autoupdate for the quest Relic Recovery.

Spawns adds: a Libant lexiconian, a Libant shrewdian, a repository guardian, Prototype Drelok, Prototype Dracnid. Not sure if its the correct tactic, but we killed each add as it popped then went back to the named.
(If you got an enchanter get the enchanter to mez the adds then make sure they're all mezzed, keep on the name - once the name dies the adds will die with her. They get harder to mez the bigger they get.) Note: adds spawn as every 10% of the named's hp drops. You can stop dps on the named when an add is up, kill the add then go back to the named for an easy kill.

The adds don't hit very hard, but the noxious effect, "Structual Breakdown" is a VERY high damage attack and must be cured off the tank IMMEDIATELY.

Large armoured character. AoE's at about 20% HP, so AoE avoid and burn is handy. His AoE looks like fireworks, and doesn't do too much damage to a group with good arcane (magic, mental, and divine) resistance. The AoE can be healed with relative ease in an optimal group setup.

A random group of up to 6 mobs (one may be a pet class). You can tell their type by their appearance and name, but their composition varies. An enchanter certainly helps, or a class with group root. Depending on the group you can expect fun things like Sanctuary, Fake Death. Memwipe looks to occur frequently...If you happen to run upon the Monk AND the Warrior in the same group, chances are you are going to wipe unless you can get them mezzed. Otherwise it will be a struggle while trying to kill off the monk inbetween Feign Death's and the Warrior CONSTANTLY taunting you.

Boss mob. He's on his own island, surrounded by a fatal moat; "fatal" meaning that if ANY member of the party (including pets) hits the lava, EVERYone dies. A clickable platform takes you out to him.

He has a knockup AoE Blastwave, which does heat damage every 12sec. In order to not be thrown off the island players need to steer their char in mid-air. This AoE can be avoided with the various AoE avoid spells/signet, but the fight can be pretty long, so you won't be able to do this completely.

Disease AoE "Corrupting Seed" is a DoT, that needs to be cured. A mythicalled inquisitor can do this in mid-air!

Infrequent power drain - might be frontal only.

Another less damage/less common AoE is "Fel-charged Wave" - heat damage. Frontal?

At about 20% he stops AoEing, and you have a limited time to burn him (15sec?), or he does a complete heal -Fel-charged Overload (1.2Million hp)

Do not attack him from the adjascent walkway. This will trigger an immense health and power drain (probably a scripted effect).